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From 24db36ad20239841b897efb41442841ebf5d2f78 Mon Sep 17 00:00:00 2001
From: Jorge Ramirez-Ortiz <jorge.ramirez-ortiz@linaro.org>
Date: Wed, 2 Mar 2016 12:00:12 -0500
Subject: [PATCH 58/91] mtd: mediatek: driver for MTK Smart Device Gen1 NAND
This patch adds support for mediatek's SDG1 NFC nand controller
embedded in SoC 2701.
UBIFS support has been successfully tested.
Signed-off-by: Jorge Ramirez-Ortiz <jorge.ramirez-ortiz@linaro.org>
---
drivers/mtd/nand/Kconfig | 6 +
drivers/mtd/nand/Makefile | 1 +
drivers/mtd/nand/mtksdg1_nand.c | 1535 +++++++++++++++++++++++++++++++++++
drivers/mtd/nand/mtksdg1_nand_ecc.h | 75 ++
drivers/mtd/nand/mtksdg1_nand_nfi.h | 119 +++
5 files changed, 1736 insertions(+)
create mode 100644 drivers/mtd/nand/mtksdg1_nand.c
create mode 100644 drivers/mtd/nand/mtksdg1_nand_ecc.h
create mode 100644 drivers/mtd/nand/mtksdg1_nand_nfi.h
--- a/drivers/mtd/nand/Kconfig
+++ b/drivers/mtd/nand/Kconfig
@@ -546,4 +546,10 @@ config MTD_NAND_HISI504
help
Enables support for NAND controller on Hisilicon SoC Hip04.
+config MTD_NAND_MTKSDG1
+ tristate "Support for NAND controller on MTK Smart Device SoCs"
+ depends on HAS_DMA
+ help
+ Enables support for NAND controller on MTK Smart Device SoCs.
+
endif # MTD_NAND
--- a/drivers/mtd/nand/Makefile
+++ b/drivers/mtd/nand/Makefile
@@ -55,5 +55,6 @@ obj-$(CONFIG_MTD_NAND_BCM47XXNFLASH) +=
obj-$(CONFIG_MTD_NAND_SUNXI) += sunxi_nand.o
obj-$(CONFIG_MTD_NAND_HISI504) += hisi504_nand.o
obj-$(CONFIG_MTD_NAND_BRCMNAND) += brcmnand/
+obj-$(CONFIG_MTD_NAND_MTKSDG1) += mtksdg1_nand.o
nand-objs := nand_base.o nand_bbt.o nand_timings.o
--- /dev/null
+++ b/drivers/mtd/nand/mtksdg1_nand.c
@@ -0,0 +1,1535 @@
+/*
+ * MTK smart device NAND Flash controller driver.
+ * Copyright (C) 2015-2016 MediaTek Inc.
+ * Authors: Xiaolei Li <xiaolei.li@mediatek.com>
+ * Jorge Ramirez-Ortiz <jorge.ramirez-ortiz@linaro.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/platform_device.h>
+#include <linux/dma-mapping.h>
+#include <linux/interrupt.h>
+#include <linux/of_mtd.h>
+#include <linux/delay.h>
+#include <linux/clk.h>
+#include <linux/mtd/partitions.h>
+#include <linux/mtd/nand.h>
+#include <linux/mtd/mtd.h>
+#include <linux/module.h>
+
+#include "mtksdg1_nand_nfi.h"
+#include "mtksdg1_nand_ecc.h"
+
+#define MTK_IRQ_ECC "mtksdg1-nand-ecc"
+#define MTK_IRQ_NFI "mtksdg1-nand-nfi"
+#define MTK_NAME "mtksdg1-nand"
+
+#define KB(x) ((x) * 1024UL)
+#define MB(x) (KB(x) * 1024UL)
+
+#define SECTOR_SHIFT (10)
+#define SECTOR_SIZE (1UL << SECTOR_SHIFT)
+#define BYTES_TO_SECTORS(x) ((x) >> SECTOR_SHIFT)
+#define SECTORS_TO_BYTES(x) ((x) << SECTOR_SHIFT)
+
+#define MTK_TIMEOUT (500)
+#define MTK_RESET_TIMEOUT (1 * HZ)
+
+#define MTK_ECC_PARITY_BITS (14)
+#define MTK_NAND_MAX_CHIP (2)
+
+#define MTK_OOB_ON (1)
+#define MTK_OOB_OFF (0)
+
+/* raw accesses do not use ECC (ecc = !raw) */
+#define MTK_ECC_OFF (1)
+#define MTK_ECC_ON (0)
+
+struct mtk_nfc_clk {
+ struct clk *nfiecc_clk;
+ struct clk *nfi_clk;
+ struct clk *pad_clk;
+};
+
+struct mtk_nfc_saved_reg {
+ struct {
+ u32 enccnfg;
+ u32 deccnfg;
+ } ecc;
+ struct {
+ u32 emp_thresh;
+ u16 pagefmt;
+ u32 acccon;
+ u16 cnrnb;
+ u16 csel;
+ } nfi;
+};
+
+struct mtk_nfc_host {
+ struct mtk_nfc_clk clk;
+ struct nand_chip chip;
+ struct device *dev;
+
+ struct {
+ struct completion complete;
+ void __iomem *base;
+ } nfi;
+
+ struct {
+ struct completion complete;
+ void __iomem *base;
+ u32 dec_sec;
+ } ecc;
+
+ u32 fdm_reg[MTKSDG1_NFI_FDM_REG_SIZE / sizeof(u32)];
+ bool switch_oob;
+ u32 row_nob;
+ u8 *buffer;
+
+#ifdef CONFIG_PM_SLEEP
+ struct mtk_nfc_saved_reg saved_reg;
+#endif
+};
+
+static struct nand_ecclayout nand_2k_64 = {
+ .oobfree = { {0, 16} },
+};
+
+static struct nand_ecclayout nand_4k_128 = {
+ .oobfree = { {0, 32} },
+};
+
+/* NFI register access */
+static inline void mtk_nfi_writel(struct mtk_nfc_host *host, u32 val, u32 reg)
+{
+ writel(val, host->nfi.base + reg);
+}
+static inline void mtk_nfi_writew(struct mtk_nfc_host *host, u16 val, u32 reg)
+{
+ writew(val, host->nfi.base + reg);
+}
+static inline u32 mtk_nfi_readl(struct mtk_nfc_host *host, u32 reg)
+{
+ return readl_relaxed(host->nfi.base + reg);
+}
+static inline u16 mtk_nfi_readw(struct mtk_nfc_host *host, u32 reg)
+{
+ return readw_relaxed(host->nfi.base + reg);
+}
+static inline u8 mtk_nfi_readb(struct mtk_nfc_host *host, u32 reg)
+{
+ return readb_relaxed(host->nfi.base + reg);
+}
+
+/* ECC register access */
+static inline void mtk_ecc_writel(struct mtk_nfc_host *host, u32 val, u32 reg)
+{
+ writel(val, host->ecc.base + reg);
+}
+static inline void mtk_ecc_writew(struct mtk_nfc_host *host, u16 val, u32 reg)
+{
+ writew(val, host->ecc.base + reg);
+}
+static inline u32 mtk_ecc_readl(struct mtk_nfc_host *host, u32 reg)
+{
+ return readl_relaxed(host->ecc.base + reg);
+}
+static inline u16 mtk_ecc_readw(struct mtk_nfc_host *host, u32 reg)
+{
+ return readw_relaxed(host->ecc.base + reg);
+}
+
+static void mtk_nfc_hw_reset(struct mtk_nfc_host *host)
+{
+ unsigned long timeout = MTK_RESET_TIMEOUT;
+ struct device *dev = host->dev;
+ u32 val;
+
+ /* reset the state machine, data fifo and fdm data */
+ mtk_nfi_writel(host, CON_FIFO_FLUSH | CON_NFI_RST, MTKSDG1_NFI_CON);
+ timeout += jiffies;
+ do {
+ val = mtk_nfi_readl(host, MTKSDG1_NFI_MASTER_STA);
+ val &= MASTER_STA_MASK;
+ if (!val)
+ return;
+ usleep_range(50, 100);
+
+ } while (time_before(jiffies, timeout));
+
+ dev_warn(dev, "nfi master active after in reset [0x%x] = 0x%x\n",
+ MTKSDG1_NFI_MASTER_STA, val);
+};
+
+static int mtk_nfc_set_command(struct mtk_nfc_host *host, u8 command)
+{
+ unsigned long timeout = msecs_to_jiffies(MTK_TIMEOUT);
+ struct device *dev = host->dev;
+ u32 val;
+
+ mtk_nfi_writel(host, command, MTKSDG1_NFI_CMD);
+
+ /* wait for the NFI core to enter command mode */
+ timeout += jiffies;
+ do {
+ val = mtk_nfi_readl(host, MTKSDG1_NFI_STA);
+ val &= STA_CMD;
+ if (!val)
+ return 0;
+ cpu_relax();
+
+ } while (time_before(jiffies, timeout));
+ dev_warn(dev, "nfi core timed out entering command mode\n");
+
+ return -EIO;
+}
+
+static int mtk_nfc_set_address(struct mtk_nfc_host *host, u32 column, u32 row,
+ u8 colnob, u8 row_nob)
+{
+ unsigned long timeout = msecs_to_jiffies(MTK_TIMEOUT);
+ struct device *dev = host->dev;
+ u32 addr_nob, val;
+
+ addr_nob = colnob | (row_nob << ADDR_ROW_NOB_SHIFT);
+ mtk_nfi_writel(host, column, MTKSDG1_NFI_COLADDR);
+ mtk_nfi_writel(host, row, MTKSDG1_NFI_ROWADDR);
+ mtk_nfi_writel(host, addr_nob, MTKSDG1_NFI_ADDRNOB);
+
+ /* wait for the NFI core to enter address mode */
+ timeout += jiffies;
+ do {
+ val = mtk_nfi_readl(host, MTKSDG1_NFI_STA);
+ val &= STA_ADDR;
+ if (!val)
+ return 0;
+ cpu_relax();
+
+ } while (time_before(jiffies, timeout));
+
+ dev_warn(dev, "nfi core timed out entering address mode\n");
+
+ return -EIO;
+}
+
+static inline void mtk_ecc_encoder_idle(struct mtk_nfc_host *host)
+{
+ unsigned long timeout = msecs_to_jiffies(MTK_TIMEOUT);
+ struct device *dev = host->dev;
+ u32 val;
+
+ timeout += jiffies;
+ do {
+ val = mtk_ecc_readl(host, MTKSDG1_ECC_ENCIDLE);
+ val &= ENC_IDLE;
+ if (val)
+ return;
+ cpu_relax();
+
+ } while (time_before(jiffies, timeout));
+
+ dev_warn(dev, "hw init ecc encoder not idle\n");
+}
+
+static inline void mtk_ecc_decoder_idle(struct mtk_nfc_host *host)
+{
+ unsigned long timeout = msecs_to_jiffies(MTK_TIMEOUT);
+ struct device *dev = host->dev;
+ u32 val;
+
+ timeout += jiffies;
+ do {
+ val = mtk_ecc_readw(host, MTKSDG1_ECC_DECIDLE);
+ val &= DEC_IDLE;
+ if (val)
+ return;
+ cpu_relax();
+
+ } while (time_before(jiffies, timeout));
+
+ dev_warn(dev, "hw init ecc decoder not idle\n");
+}
+
+static int mtk_nfc_transfer_done(struct mtk_nfc_host *host, u32 sectors)
+{
+ unsigned long timeout = msecs_to_jiffies(MTK_TIMEOUT);
+ u32 cnt;
+
+ /* wait for the sector count */
+ timeout += jiffies;
+ do {
+ cnt = mtk_nfi_readl(host, MTKSDG1_NFI_ADDRCNTR);
+ cnt &= CNTR_MASK;
+ if (cnt >= sectors)
+ return 0;
+ cpu_relax();
+
+ } while (time_before(jiffies, timeout));
+
+ return -EIO;
+}
+
+static int mtk_nfc_subpage_done(struct mtk_nfc_host *host, int sectors)
+{
+ unsigned long timeout = msecs_to_jiffies(MTK_TIMEOUT);
+ u32 val;
+
+ timeout += jiffies;
+ do {
+ val = mtk_nfi_readl(host, MTKSDG1_NFI_BYTELEN);
+ val &= CNTR_MASK;
+ if (val >= sectors)
+ return 0;
+ cpu_relax();
+
+ } while (time_before(jiffies, timeout));
+
+ return -EIO;
+}
+
+static inline int mtk_nfc_data_ready(struct mtk_nfc_host *host)
+{
+ unsigned long timeout = msecs_to_jiffies(MTK_TIMEOUT);
+ u8 val;
+
+ timeout += jiffies;
+ do {
+ val = mtk_nfi_readw(host, MTKSDG1_NFI_PIO_DIRDY);
+ val &= PIO_DI_RDY;
+ if (val)
+ return 0;
+ cpu_relax();
+
+ } while (time_before(jiffies, timeout));
+
+ /* data _MUST_ not be accessed */
+ return -EIO;
+}
+
+static int mtk_nfc_hw_runtime_config(struct mtd_info *mtd)
+{
+ struct nand_chip *chip = mtd_to_nand(mtd);
+ struct mtk_nfc_host *host = nand_get_controller_data(chip);
+ struct device *dev = host->dev;
+ u32 dec_size, enc_size;
+ u32 ecc_bit, ecc_level;
+ u32 spare, fmt;
+ u32 reg;
+
+ host->row_nob = 1;
+ if (chip->chipsize > MB(32))
+ host->row_nob = chip->chipsize > MB(128) ? 3 : 2;
+
+ spare = mtd->oobsize / BYTES_TO_SECTORS(mtd->writesize);
+ switch (spare) {
+ case 16:
+ ecc_bit = ECC_CNFG_4BIT;
+ ecc_level = 4;
+ break;
+ case 32:
+ ecc_bit = ECC_CNFG_12BIT;
+ ecc_level = 12;
+ break;
+ default:
+ dev_err(dev, "invalid spare size per sector: %d\n", spare);
+ return -EINVAL;
+ }
+
+ chip->ecc.strength = ecc_level;
+ chip->ecc.size = SECTOR_SIZE;
+
+ switch (mtd->writesize) {
+ case KB(2):
+ fmt = PAGEFMT_512_2K;
+ chip->ecc.layout = &nand_2k_64;
+ break;
+ case KB(4):
+ fmt = PAGEFMT_2K_4K;
+ chip->ecc.layout = &nand_4k_128;
+ break;
+ case KB(8):
+ fmt = PAGEFMT_4K_8K;
+ break;
+ default:
+ dev_err(dev, "invalid page size: %d\n", mtd->writesize);
+ return -EINVAL;
+ }
+
+ /* configure PAGE FMT */
+ reg = fmt;
+ reg |= PAGEFMT_SPARE_16 << PAGEFMT_SPARE_SHIFT;
+ reg |= MTKSDG1_NFI_FDM_REG_SIZE << PAGEFMT_FDM_SHIFT;
+ reg |= MTKSDG1_NFI_FDM_REG_SIZE << PAGEFMT_FDM_ECC_SHIFT;
+ mtk_nfi_writew(host, reg, MTKSDG1_NFI_PAGEFMT);
+
+ /* configure ECC encoder (in bits) */
+ enc_size = (SECTOR_SIZE + MTKSDG1_NFI_FDM_REG_SIZE) << 3;
+ reg = ecc_bit | ECC_NFI_MODE | (enc_size << ECC_MS_SHIFT);
+ mtk_ecc_writel(host, reg, MTKSDG1_ECC_ENCCNFG);
+
+ /* configure ECC decoder (inbits) */
+ dec_size = enc_size + ecc_level * MTK_ECC_PARITY_BITS;
+ reg = ecc_bit | ECC_NFI_MODE | (dec_size << ECC_MS_SHIFT);
+ reg |= (DEC_CNFG_CORRECT | DEC_EMPTY_EN);
+ mtk_ecc_writel(host, reg, MTKSDG1_ECC_DECCNFG);
+
+ return 0;
+}
+
+static void mtk_nfc_device_reset(struct mtk_nfc_host *host)
+{
+ unsigned long timeout = msecs_to_jiffies(MTK_TIMEOUT);
+ struct device *dev = host->dev;
+ u16 chip;
+ int rc;
+
+ mtk_nfc_hw_reset(host);
+
+ /* enable reset done interrupt */
+ mtk_nfi_writew(host, INTR_RST_DONE_EN, MTKSDG1_NFI_INTR_EN);
+
+ /* configure FSM for reset operation */
+ mtk_nfi_writew(host, CNFG_OP_RESET, MTKSDG1_NFI_CNFG);
+
+ init_completion(&host->nfi.complete);
+
+ mtk_nfc_set_command(host, NAND_CMD_RESET);
+ rc = wait_for_completion_timeout(&host->nfi.complete, timeout);
+ if (!rc) {
+ chip = mtk_nfi_readw(host, MTKSDG1_NFI_CSEL);
+ dev_err(dev, "device(%d) reset timeout\n", chip);
+ }
+}
+
+static void mtk_nfc_select_chip(struct mtd_info *mtd, int chip)
+{
+ struct nand_chip *nand = mtd_to_nand(mtd);
+ struct mtk_nfc_host *host = nand_get_controller_data(nand);
+
+ if (chip < 0)
+ return;
+
+ mtk_nfi_writel(host, chip, MTKSDG1_NFI_CSEL);
+}
+
+static inline bool mtk_nfc_cmd_supported(unsigned command)
+{
+ switch (command) {
+ case NAND_CMD_RESET:
+ case NAND_CMD_READID:
+ case NAND_CMD_STATUS:
+ case NAND_CMD_READOOB:
+ case NAND_CMD_ERASE1:
+ case NAND_CMD_ERASE2:
+ case NAND_CMD_SEQIN:
+ case NAND_CMD_PAGEPROG:
+ case NAND_CMD_CACHEDPROG:
+ case NAND_CMD_READ0:
+ return true;
+ default:
+ return false;
+ }
+}
+
+static void mtk_nfc_cmdfunc(struct mtd_info *mtd, unsigned command, int column,
+ int page_addr)
+{
+ struct mtk_nfc_host *host = nand_get_controller_data(mtd_to_nand(mtd));
+ unsigned long const cmd_timeout = msecs_to_jiffies(MTK_TIMEOUT);
+ struct completion *p = &host->nfi.complete;
+ u32 val;
+ int rc;
+
+ if (mtk_nfc_cmd_supported(command))
+ mtk_nfc_hw_reset(host);
+
+ switch (command) {
+ case NAND_CMD_RESET:
+ mtk_nfc_device_reset(host);
+ break;
+ case NAND_CMD_READID:
+ val = CNFG_READ_EN | CNFG_BYTE_RW | CNFG_OP_SRD;
+ mtk_nfi_writew(host, val, MTKSDG1_NFI_CNFG);
+ mtk_nfc_set_command(host, NAND_CMD_READID);
+ mtk_nfc_set_address(host, column, 0, 1, 0);
+ mtk_nfi_writel(host, CON_SRD, MTKSDG1_NFI_CON);
+ break;
+ case NAND_CMD_STATUS:
+ val = CNFG_READ_EN | CNFG_BYTE_RW | CNFG_OP_SRD;
+ mtk_nfi_writew(host, val, MTKSDG1_NFI_CNFG);
+ mtk_nfc_set_command(host, NAND_CMD_STATUS);
+ mtk_nfi_writel(host, CON_SRD, MTKSDG1_NFI_CON);
+ break;
+ case NAND_CMD_READOOB:
+ val = CNFG_READ_EN | CNFG_BYTE_RW | CNFG_OP_READ;
+ mtk_nfi_writew(host, val, MTKSDG1_NFI_CNFG);
+ mtk_nfc_set_command(host, NAND_CMD_READ0);
+ column += mtd->writesize;
+ mtk_nfc_set_address(host, column, page_addr, 2, host->row_nob);
+ val = CON_BRD | (1 << CON_SEC_SHIFT);
+ mtk_nfi_writel(host, val, MTKSDG1_NFI_CON);
+ break;
+ case NAND_CMD_ERASE1:
+ mtk_nfi_writew(host, INTR_ERS_DONE_EN, MTKSDG1_NFI_INTR_EN);
+ mtk_nfi_writew(host, CNFG_OP_ERASE, MTKSDG1_NFI_CNFG);
+ mtk_nfc_set_command(host, NAND_CMD_ERASE1);
+ mtk_nfc_set_address(host, 0, page_addr, 0, host->row_nob);
+ break;
+ case NAND_CMD_ERASE2:
+ init_completion(p);
+ mtk_nfc_set_command(host, NAND_CMD_ERASE2);
+ rc = wait_for_completion_timeout(p, cmd_timeout);
+ if (!rc)
+ dev_err(host->dev, "erase command timeout\n");
+ break;
+ case NAND_CMD_SEQIN:
+ mtk_nfi_writew(host, CNFG_OP_PRGM, MTKSDG1_NFI_CNFG);
+ mtk_nfc_set_command(host, NAND_CMD_SEQIN);
+ mtk_nfc_set_address(host, column, page_addr, 2, host->row_nob);
+ break;
+ case NAND_CMD_PAGEPROG:
+ case NAND_CMD_CACHEDPROG:
+ mtk_nfi_writew(host, INTR_BUSY_RT_EN, MTKSDG1_NFI_INTR_EN);
+ init_completion(p);
+ mtk_nfc_set_command(host, command);
+ rc = wait_for_completion_timeout(p, cmd_timeout);
+ if (!rc)
+ dev_err(host->dev, "pageprogr command timeout\n");
+ break;
+ case NAND_CMD_READ0:
+ val = CNFG_OP_READ | CNFG_READ_EN;
+ mtk_nfi_writew(host, val, MTKSDG1_NFI_CNFG);
+ mtk_nfc_set_command(host, NAND_CMD_READ0);
+ break;
+ default:
+ dev_warn(host->dev, "command 0x%x not supported\n", command);
+ break;
+ }
+}
+
+static uint8_t mtk_nfc_read_byte(struct mtd_info *mtd)
+{
+ struct nand_chip *chip = mtd_to_nand(mtd);
+ struct mtk_nfc_host *host = nand_get_controller_data(chip);
+ int rc;
+
+ rc = mtk_nfc_data_ready(host);
+ if (rc < 0) {
+ dev_err(host->dev, "data not ready\n");
+ return NAND_STATUS_FAIL;
+ }
+
+ return mtk_nfi_readb(host, MTKSDG1_NFI_DATAR);
+}
+
+static void mtk_nfc_write_fdm(struct nand_chip *chip, u32 sectors)
+{
+ struct mtk_nfc_host *host = nand_get_controller_data(chip);
+ u8 *src, *dst;
+ int i, j, reg;
+
+ for (i = 0; i < sectors ; i++) {
+ /* read FDM from OOB into private area */
+ src = chip->oob_poi + i * MTKSDG1_NFI_FDM_REG_SIZE;
+ dst = (u8 *)host->fdm_reg;
+ memcpy(dst, src, MTKSDG1_NFI_FDM_REG_SIZE);
+
+ /* write FDM to registers */
+ for (j = 0; j < ARRAY_SIZE(host->fdm_reg); j++) {
+ reg = MTKSDG1_NFI_FDM0L + i * MTKSDG1_NFI_FDM_REG_SIZE;
+ reg += j * sizeof(host->fdm_reg[0]);
+ mtk_nfi_writel(host, host->fdm_reg[j], reg);
+ }
+ }
+}
+
+static int mtk_nfc_write_page(struct mtd_info *mtd,
+ struct nand_chip *chip, const uint8_t *buf,
+ int oob_on, int page, int raw)
+{
+
+ struct mtk_nfc_host *host = nand_get_controller_data(chip);
+ struct completion *nfi = &host->nfi.complete;
+ struct device *dev = host->dev;
+ const bool use_ecc = !raw;
+ void *q = (void *) buf;
+ dma_addr_t dma_addr;
+ size_t dmasize;
+ u32 reg;
+ int ret;
+
+ dmasize = mtd->writesize + (raw ? mtd->oobsize : 0);
+
+ dma_addr = dma_map_single(dev, q, dmasize, DMA_TO_DEVICE);
+ if (dma_mapping_error(host->dev, dma_addr)) {
+ dev_err(host->dev, "dma mapping error\n");
+ return -EINVAL;
+ }
+
+ reg = mtk_nfi_readw(host, MTKSDG1_NFI_CNFG);
+ reg |= CNFG_AHB | CNFG_DMA_BURST_EN;
+ if (use_ecc) {
+ /**
+ * OOB will be generated
+ * - FDM: from register
+ * - ECC: from HW
+ */
+ reg |= CNFG_AUTO_FMT_EN | CNFG_HW_ECC_EN;
+ mtk_nfi_writew(host, reg, MTKSDG1_NFI_CNFG);
+
+ mtk_ecc_encoder_idle(host);
+ mtk_ecc_writew(host, ENC_EN, MTKSDG1_ECC_ENCCON);
+
+ /* write OOB into the FDM registers (OOB area in MTK NAND) */
+ if (oob_on)
+ mtk_nfc_write_fdm(chip, chip->ecc.steps);
+ } else {
+ /* OOB is part of the DMA transfer */
+ mtk_nfi_writew(host, reg, MTKSDG1_NFI_CNFG);
+ }
+
+ mtk_nfi_writel(host, chip->ecc.steps << CON_SEC_SHIFT, MTKSDG1_NFI_CON);
+ mtk_nfi_writel(host, lower_32_bits(dma_addr), MTKSDG1_NFI_STRADDR);
+ mtk_nfi_writew(host, INTR_AHB_DONE_EN, MTKSDG1_NFI_INTR_EN);
+
+ init_completion(nfi);
+
+ /* start DMA */
+ reg = mtk_nfi_readl(host, MTKSDG1_NFI_CON) | CON_BWR;
+ mtk_nfi_writel(host, reg, MTKSDG1_NFI_CON);
+
+ ret = wait_for_completion_timeout(nfi, msecs_to_jiffies(MTK_TIMEOUT));
+ if (!ret) {
+ dev_err(dev, "program ahb done timeout\n");
+ mtk_nfi_writew(host, 0, MTKSDG1_NFI_INTR_EN);
+ ret = -ETIMEDOUT;
+ goto timeout;
+ }
+
+ ret = mtk_nfc_transfer_done(host, chip->ecc.steps);
+ if (ret < 0)
+ dev_err(dev, "hwecc write timeout\n");
+timeout:
+ dma_unmap_single(host->dev, dma_addr, dmasize, DMA_TO_DEVICE);
+
+ if (use_ecc) {
+ mtk_ecc_encoder_idle(host);
+ mtk_ecc_writew(host, ENC_DE, MTKSDG1_ECC_ENCCON);
+ }
+
+ mtk_nfi_writel(host, 0, MTKSDG1_NFI_CON);
+
+ return ret;
+}
+
+static int mtk_nfc_write_page_hwecc(struct mtd_info *mtd,
+ struct nand_chip *chip, const uint8_t *buf,
+ int oob_on, int page)
+{
+ return mtk_nfc_write_page(mtd, chip, buf, oob_on, page, MTK_ECC_ON);
+}
+
+static int mtk_nfc_write_page_raw(struct mtd_info *mtd, struct nand_chip *chip,
+ const uint8_t *buf, int oob_on, int pg)
+{
+ struct mtk_nfc_host *host = nand_get_controller_data(chip);
+ uint8_t *src, *dst;
+ size_t len;
+ u32 i;
+
+ memset(host->buffer, 0xff, mtd->writesize + mtd->oobsize);
+
+ /* MTK internal 4KB page data layout:
+ * ----------------------------------
+ * PAGE = 4KB, SECTOR = 1KB, OOB=128B
+ * page = sector_oob1 + sector_oob2 + sector_oob3 + sector_oob4
+ * sector_oob = data (1KB) + FDM (8B) + ECC parity (21B) + free (3B)
+ *
+ */
+ len = SECTOR_SIZE + mtd->oobsize / chip->ecc.steps;
+
+ for (i = 0; i < chip->ecc.steps; i++) {
+
+ if (buf) {
+ src = (uint8_t *) buf + i * SECTOR_SIZE;
+ dst = host->buffer + i * len;
+ memcpy(dst, src, SECTOR_SIZE);
+ }
+
+ if (oob_on) {
+ src = chip->oob_poi + i * MTKSDG1_NFI_FDM_REG_SIZE;
+ dst = host->buffer + i * len + SECTOR_SIZE;
+ memcpy(dst, src, MTKSDG1_NFI_FDM_REG_SIZE);
+ }
+ }
+
+ return mtk_nfc_write_page(mtd, chip, host->buffer, MTK_OOB_OFF, pg,
+ MTK_ECC_OFF);
+}
+
+static int mtk_nfc_sector_encode(struct nand_chip *chip, u8 *data)
+{
+ struct mtk_nfc_host *host = nand_get_controller_data(chip);
+ struct completion *ecc = &host->ecc.complete;
+ u32 reg, parity_bytes, i;
+ dma_addr_t dma_addr;
+ u32 *parity_region;
+ int rc, ret = 0;
+ size_t dmasize;
+
+ dmasize = SECTOR_SIZE + MTKSDG1_NFI_FDM_REG_SIZE;
+ dma_addr = dma_map_single(host->dev, data, dmasize, DMA_TO_DEVICE);
+ if (dma_mapping_error(host->dev, dma_addr)) {
+ dev_err(host->dev, "dma mapping error\n");
+ return -EINVAL;
+ }
+
+ /* enable the encoder in DMA mode to calculate the ECC bytes */
+ reg = mtk_ecc_readl(host, MTKSDG1_ECC_ENCCNFG);
+ reg &= (~ECC_ENC_MODE_MASK);
+ reg |= ECC_DMA_MODE;
+ mtk_ecc_writel(host, reg, MTKSDG1_ECC_ENCCNFG);
+
+ mtk_ecc_writel(host, ENC_IRQEN, MTKSDG1_ECC_ENCIRQ_EN);
+ mtk_ecc_writel(host, lower_32_bits(dma_addr), MTKSDG1_ECC_ENCDIADDR);
+
+ init_completion(ecc);
+ mtk_ecc_writew(host, ENC_EN, MTKSDG1_ECC_ENCCON);
+
+ rc = wait_for_completion_timeout(ecc, msecs_to_jiffies(MTK_TIMEOUT));
+ if (!rc) {
+ dev_err(host->dev, "ecc encode done timeout\n");
+ mtk_ecc_writel(host, 0, MTKSDG1_ECC_ENCIRQ_EN);
+ ret = -ETIMEDOUT;
+ goto timeout;
+ }
+
+ mtk_ecc_encoder_idle(host);
+
+ /**
+ * Program ECC bytes to OOB
+ * per sector oob = FDM + ECC + SPARE
+ */
+
+ parity_region = (u32 *) (data + SECTOR_SIZE + MTKSDG1_NFI_FDM_REG_SIZE);
+ parity_bytes = (chip->ecc.strength * MTK_ECC_PARITY_BITS + 7) >> 3;
+
+ /* write the parity bytes generated by the ECC back to the OOB region */
+ for (i = 0; i < parity_bytes; i += sizeof(u32))
+ *parity_region++ = mtk_ecc_readl(host, MTKSDG1_ECC_ENCPAR0 + i);
+
+timeout:
+
+ dma_unmap_single(host->dev, dma_addr, dmasize, DMA_TO_DEVICE);
+
+ mtk_ecc_writew(host, 0, MTKSDG1_ECC_ENCCON);
+ reg = mtk_ecc_readl(host, MTKSDG1_ECC_ENCCNFG);
+ reg &= (~ECC_ENC_MODE_MASK);
+ reg |= ECC_NFI_MODE;
+ mtk_ecc_writel(host, reg, MTKSDG1_ECC_ENCCNFG);
+
+ return ret;
+}
+
+static int mtk_nfc_write_subpage_hwecc(struct mtd_info *mtd,
+ struct nand_chip *chip, uint32_t offset, uint32_t data_len,
+ const uint8_t *buf, int oob_on, int pg)
+{
+ struct mtk_nfc_host *host = nand_get_controller_data(chip);
+ uint8_t *src, *dst;
+ u32 start, end;
+ size_t len;
+ int i, ret;
+
+ start = BYTES_TO_SECTORS(offset);
+ end = BYTES_TO_SECTORS(offset + data_len + SECTOR_SIZE - 1);
+
+ len = SECTOR_SIZE + mtd->oobsize / chip->ecc.steps;
+
+ memset(host->buffer, 0xff, mtd->writesize + mtd->oobsize);
+ for (i = 0; i < chip->ecc.steps; i++) {
+
+ /* write data */
+ src = (uint8_t *) buf + i * SECTOR_SIZE;
+ dst = host->buffer + i * len;
+ memcpy(dst, src, SECTOR_SIZE);
+
+ if (i < start)
+ continue;
+
+ if (i >= end)
+ continue;
+
+ /* write fdm */
+ if (oob_on) {
+ src = chip->oob_poi + i * MTKSDG1_NFI_FDM_REG_SIZE;
+ dst = host->buffer + i * len + SECTOR_SIZE;
+ memcpy(dst, src, MTKSDG1_NFI_FDM_REG_SIZE);
+ }
+
+ /* point to the start of data */
+ src = host->buffer + i * len;
+
+ /* program the CRC back to the OOB */
+ ret = mtk_nfc_sector_encode(chip, src);
+ if (ret < 0)
+ return ret;
+ }
+
+ /* use the data in the private buffer (now with FDM and CRC) to perform
+ * a raw write
+ */
+ src = host->buffer;
+ return mtk_nfc_write_page(mtd, chip, src, MTK_OOB_OFF, pg, MTK_ECC_OFF);
+}
+
+static int mtk_nfc_write_oob(struct mtd_info *mtd, struct nand_chip *chip,
+ int page)
+{
+ u8 *buf = chip->buffers->databuf;
+ int ret;
+
+ memset(buf, 0xff, mtd->writesize);
+ chip->cmdfunc(mtd, NAND_CMD_SEQIN, 0x00, page);
+ ret = mtk_nfc_write_page_hwecc(mtd, chip, buf, MTK_OOB_ON, page);
+ if (ret < 0)
+ return -EIO;
+
+ chip->cmdfunc(mtd, NAND_CMD_PAGEPROG, -1, -1);
+ ret = chip->waitfunc(mtd, chip);
+
+ return ret & NAND_STATUS_FAIL ? -EIO : 0;
+}
+
+static int mtk_nfc_write_oob_raw(struct mtd_info *mtd, struct nand_chip *chip,
+ int page)
+{
+ int ret;
+
+ chip->cmdfunc(mtd, NAND_CMD_SEQIN, 0x00, page);
+ ret = mtk_nfc_write_page_raw(mtd, chip, NULL, MTK_OOB_ON, page);
+ if (ret < 0)
+ return -EIO;
+
+ chip->cmdfunc(mtd, NAND_CMD_PAGEPROG, -1, -1);
+ ret = chip->waitfunc(mtd, chip);
+
+ return ret & NAND_STATUS_FAIL ? -EIO : 0;
+}
+
+static int mtk_nfc_ecc_check(struct mtd_info *mtd, struct nand_chip *chip,
+ u32 sectors)
+{
+ struct mtk_nfc_host *host = nand_get_controller_data(chip);
+ u32 offset, i, err, max_bitflip;
+
+ max_bitflip = 0;
+
+ for (i = 0; i < sectors; i++) {
+ offset = (i >> 2) << 2;
+ err = mtk_ecc_readl(host, MTKSDG1_ECC_DECENUM0 + offset);
+ err = err >> ((i % 4) * 8);
+ err &= ERR_MASK;
+ if (err == ERR_MASK) {
+ /* uncorrectable errors */
+ mtd->ecc_stats.failed++;
+ continue;
+ }
+
+ mtd->ecc_stats.corrected += err;
+ max_bitflip = max_t(u32, max_bitflip, err);
+ }
+
+ return max_bitflip;
+}
+
+static void mtk_nfc_read_fdm(struct nand_chip *chip, u32 sectors)
+{
+ struct mtk_nfc_host *host = nand_get_controller_data(chip);
+ int i, j, reg;
+ u8 *dst, *src;
+
+ for (i = 0; i < sectors; i++) {
+ /* read FDM register into host memory */
+ for (j = 0; j < ARRAY_SIZE(host->fdm_reg); j++) {
+ reg = MTKSDG1_NFI_FDM0L + i * MTKSDG1_NFI_FDM_REG_SIZE;
+ reg += j * sizeof(host->fdm_reg[0]);
+ host->fdm_reg[j] = mtk_nfi_readl(host, reg);
+ }
+
+ /* copy FDM register from host to OOB */
+ src = (u8 *)host->fdm_reg;
+ dst = chip->oob_poi + i * MTKSDG1_NFI_FDM_REG_SIZE;
+ memcpy(dst, src, MTKSDG1_NFI_FDM_REG_SIZE);
+ }
+}
+
+static int mtk_nfc_update_oob(struct mtd_info *mtd, struct nand_chip *chip,
+ u8 *buf, u32 sectors)
+{
+ struct mtk_nfc_host *host = nand_get_controller_data(chip);
+ int i, bitflips = 0;
+
+ /* if the page is empty, no bitflips and clear data and oob */
+ if (mtk_nfi_readl(host, MTKSDG1_NFI_STA) & STA_EMP_PAGE) {
+ memset(buf, 0xff, SECTORS_TO_BYTES(sectors));
+
+ /* empty page: update OOB with 0xFF */
+ for (i = 0; i < sectors; i++) {
+ memset(chip->oob_poi + i * MTKSDG1_NFI_FDM_REG_SIZE,
+ 0xff, MTKSDG1_NFI_FDM_REG_SIZE);
+ }
+ } else {
+ /* update OOB with HW info */
+ mtk_nfc_read_fdm(chip, sectors);
+
+ /* return the bitflips */
+ bitflips = mtk_nfc_ecc_check(mtd, chip, sectors);
+ }
+
+ return bitflips;
+}
+
+static int mtk_nfc_block_markbad(struct mtd_info *mtd, loff_t ofs)
+{
+ struct nand_chip *chip = mtd_to_nand(mtd);
+ u8 *buf = chip->buffers->databuf;
+ int rc, i, pg;
+
+ /* block_markbad writes 0x00 at data and OOB */
+ memset(buf, 0x00, mtd->writesize + mtd->oobsize);
+
+ /* Write to first/last page(s) if necessary */
+ if (chip->bbt_options & NAND_BBT_SCANLASTPAGE)
+ ofs += mtd->erasesize - mtd->writesize;
+
+ i = 0;
+ do {
+ pg = (int)(ofs >> chip->page_shift);
+
+ /**
+ * write 0x00 to DATA & OOB in flash
+ * No need to reorganize the page since it is all 0x00
+ */
+ chip->cmdfunc(mtd, NAND_CMD_SEQIN, 0x00, pg);
+ rc = mtk_nfc_write_page(mtd, chip, buf, MTK_OOB_OFF, pg,
+ MTK_ECC_OFF);
+ if (rc < 0)
+ return rc;
+
+ chip->cmdfunc(mtd, NAND_CMD_PAGEPROG, -1, -1);
+ rc = chip->waitfunc(mtd, chip);
+ rc = rc & NAND_STATUS_FAIL ? -EIO : 0;
+ if (rc < 0)
+ return rc;
+
+ ofs += mtd->writesize;
+ i++;
+
+ } while ((chip->bbt_options & NAND_BBT_SCAN2NDPAGE) && i < 2);
+
+ return 0;
+}
+
+static int mtk_nfc_read_subpage(struct mtd_info *mtd, struct nand_chip *chip,
+ uint32_t data_offs, uint32_t readlen, uint8_t *bufpoi,
+ int page, int raw)
+{
+ struct mtk_nfc_host *host = nand_get_controller_data(chip);
+ unsigned long timeout = msecs_to_jiffies(MTK_TIMEOUT);
+ u32 reg, column, spare, sectors, start, end;
+ struct completion *nfi, *ecc;
+ const bool use_ecc = !raw;
+ int bitflips = -EIO;
+ dma_addr_t dma_addr;
+ size_t len;
+ u8 *buf;
+ int rc;
+
+ nfi = &host->nfi.complete;
+ ecc = &host->ecc.complete;
+
+ start = BYTES_TO_SECTORS(data_offs);
+ end = BYTES_TO_SECTORS(data_offs + readlen + SECTOR_SIZE - 1);
+ sectors = end - start;
+
+ spare = mtd->oobsize / chip->ecc.steps;
+ column = start * (SECTOR_SIZE + spare);
+
+ len = SECTORS_TO_BYTES(sectors) + (raw ? sectors * spare : 0);
+ buf = bufpoi + SECTORS_TO_BYTES(start);
+
+ /* map the device memory */
+ dma_addr = dma_map_single(host->dev, buf, len, DMA_FROM_DEVICE);
+ if (dma_mapping_error(host->dev, dma_addr)) {
+ dev_err(host->dev, "dma mapping error\n");
+ return -EINVAL;
+ }
+
+ /* configure the transfer */
+ reg = mtk_nfi_readw(host, MTKSDG1_NFI_CNFG);
+ reg |= CNFG_DMA_BURST_EN | CNFG_AHB;
+ if (use_ecc) {
+ reg |= CNFG_AUTO_FMT_EN | CNFG_HW_ECC_EN;
+ mtk_nfi_writew(host, reg, MTKSDG1_NFI_CNFG);
+
+ /* enable encoder */
+ mtk_ecc_decoder_idle(host);
+ mtk_ecc_writel(host, DEC_EN, MTKSDG1_ECC_DECCON);
+ } else
+ mtk_nfi_writew(host, reg, MTKSDG1_NFI_CNFG);
+
+ mtk_nfi_writel(host, sectors << CON_SEC_SHIFT, MTKSDG1_NFI_CON);
+ mtk_nfi_writew(host, INTR_BUSY_RT_EN, MTKSDG1_NFI_INTR_EN);
+
+ init_completion(nfi);
+
+ mtk_nfc_set_address(host, column, page, 2, host->row_nob);
+ mtk_nfc_set_command(host, NAND_CMD_READSTART);
+ rc = wait_for_completion_timeout(nfi, timeout);
+ if (!rc) {
+ dev_err(host->dev, "read busy return timeout\n");
+ goto error;
+ }
+
+ mtk_nfi_writew(host, INTR_AHB_DONE_EN, MTKSDG1_NFI_INTR_EN);
+ mtk_nfi_writel(host, lower_32_bits(dma_addr), MTKSDG1_NFI_STRADDR);
+
+ if (use_ecc) {
+ /* program ECC with sector count */
+ host->ecc.dec_sec = sectors;
+ init_completion(ecc);
+ mtk_ecc_writew(host, DEC_IRQEN, MTKSDG1_ECC_DECIRQ_EN);
+ }
+
+ init_completion(nfi);
+
+ /* start DMA */
+ reg = mtk_nfi_readl(host, MTKSDG1_NFI_CON) | CON_BRD;
+ mtk_nfi_writel(host, reg, MTKSDG1_NFI_CON);
+
+ rc = wait_for_completion_timeout(nfi, timeout);
+ if (!rc)
+ dev_warn(host->dev, "read ahb/dma done timeout\n");
+
+ /* DMA interrupt didn't trigger, check page done just in case */
+ rc = mtk_nfc_subpage_done(host, sectors);
+ if (rc < 0) {
+ dev_err(host->dev, "subpage done timeout\n");
+ goto error;
+ }
+
+ /* raw transfer successful */
+ bitflips = 0;
+
+ if (use_ecc) {
+ rc = wait_for_completion_timeout(ecc, timeout);
+ if (!rc) {
+ dev_err(host->dev, "ecc decode timeout\n");
+ host->ecc.dec_sec = 0;
+ bitflips = -ETIMEDOUT;
+ goto error;
+ }
+ bitflips = mtk_nfc_update_oob(mtd, chip, buf, sectors);
+ }
+
+error:
+ dma_unmap_single(host->dev, dma_addr, len, DMA_FROM_DEVICE);
+
+ if (use_ecc) {
+ /* make sure the ECC dec irq is disabled */
+ mtk_ecc_writew(host, 0, MTKSDG1_ECC_DECIRQ_EN);
+ mtk_ecc_decoder_idle(host);
+
+ /* disable ECC dec */
+ mtk_ecc_writew(host, 0, MTKSDG1_ECC_DECCON);
+ }
+
+ mtk_nfi_writel(host, 0, MTKSDG1_NFI_CON);
+
+ return bitflips;
+}
+
+static int mtk_nfc_read_subpage_hwecc(struct mtd_info *mtd,
+ struct nand_chip *chip, uint32_t data_offs,
+ uint32_t readlen, uint8_t *bufpoi, int page)
+{
+ return mtk_nfc_read_subpage(mtd, chip, data_offs, readlen,
+ bufpoi, page, MTK_ECC_ON);
+}
+
+static int mtk_nfc_read_page_hwecc(struct mtd_info *mtd, struct nand_chip *chip,
+ uint8_t *buf, int oob_on, int page)
+{
+ return mtk_nfc_read_subpage_hwecc(mtd, chip, 0, mtd->writesize,
+ buf, page);
+}
+
+static int mtk_nfc_read_page_raw(struct mtd_info *mtd, struct nand_chip *chip,
+ uint8_t *buf, int oob_on, int page)
+{
+ struct mtk_nfc_host *host = nand_get_controller_data(chip);
+ uint8_t *src, *dst;
+ int i, ret;
+ size_t len;
+
+ dst = host->buffer;
+ memset(dst, 0xff, mtd->writesize + mtd->oobsize);
+ ret = mtk_nfc_read_subpage(mtd, chip, 0, mtd->writesize, dst, page, 1);
+ if (ret < 0)
+ return ret;
+
+ len = SECTOR_SIZE + mtd->oobsize / chip->ecc.steps;
+
+ /* copy to the output buffer */
+ for (i = 0; i < chip->ecc.steps; i++) {
+
+ /* copy sector data */
+ if (buf) {
+ src = host->buffer + i * len;
+ dst = buf + i * SECTOR_SIZE;
+ memcpy(dst, src, SECTOR_SIZE);
+ }
+
+ /* copy FDM data to OOB */
+ if (oob_on) {
+ src = host->buffer + i * len + SECTOR_SIZE;
+ dst = chip->oob_poi + i * MTKSDG1_NFI_FDM_REG_SIZE;
+ memcpy(dst, src, MTKSDG1_NFI_FDM_REG_SIZE);
+ }
+ }
+
+ return ret;
+}
+
+static void mtk_nfc_switch_oob(struct mtd_info *mtd, struct nand_chip *chip,
+ uint8_t *buf)
+{
+ struct mtk_nfc_host *host = nand_get_controller_data(chip);
+ size_t spare;
+ u32 sectors;
+ u8 *bufpoi;
+ int len;
+
+ spare = mtd->oobsize / chip->ecc.steps;
+ sectors = mtd->writesize / (SECTOR_SIZE + spare);
+
+ /**
+ * MTK: DATA+oob1, DATA+oob2, DATA+oob3 ...
+ * LNX: DATA+OOB
+ */
+ /* point to the last oob_i from the NAND device*/
+ bufpoi = buf + mtd->writesize - (sectors * spare);
+ len = sizeof(host->fdm_reg);
+
+ /* copy NAND oob to private area */
+ memcpy(host->fdm_reg, bufpoi, len);
+
+ /* copy oob_poi to NAND */
+ memcpy(bufpoi, chip->oob_poi, len);
+
+ /* copy NAND oob to oob_poi */
+ memcpy(chip->oob_poi, host->fdm_reg, sizeof(host->fdm_reg));
+ memset(host->fdm_reg, 0x00, len);
+}
+
+static int mtk_nfc_read_oob(struct mtd_info *mtd, struct nand_chip *chip,
+ int page)
+{
+ struct mtk_nfc_host *host = nand_get_controller_data(chip);
+ u8 *buf = chip->buffers->databuf;
+ struct mtd_ecc_stats stats;
+ int ret;
+
+ stats = mtd->ecc_stats;
+
+ memset(buf, 0xff, mtd->writesize);
+ chip->cmdfunc(mtd, NAND_CMD_READ0, 0, page);
+
+ ret = mtk_nfc_read_page_hwecc(mtd, chip, buf, 1, page);
+
+ if (host->switch_oob)
+ mtk_nfc_switch_oob(mtd, chip, buf);
+
+ if (ret < mtd->bitflip_threshold)
+ mtd->ecc_stats.corrected = stats.corrected;
+
+ return ret;
+}
+
+static int mtk_nfc_read_oob_raw(struct mtd_info *mtd, struct nand_chip *chip,
+ int page)
+{
+ chip->cmdfunc(mtd, NAND_CMD_READ0, 0, page);
+
+ return mtk_nfc_read_page_raw(mtd, chip, NULL, MTK_OOB_ON, page);
+}
+
+static inline void mtk_nfc_hw_init(struct mtk_nfc_host *host)
+{
+ mtk_nfi_writel(host, 0x10804211, MTKSDG1_NFI_ACCCON);
+ mtk_nfi_writew(host, 0xf1, MTKSDG1_NFI_CNRNB);
+ mtk_nfc_hw_reset(host);
+
+ /* clear interrupt */
+ mtk_nfi_readl(host, MTKSDG1_NFI_INTR_STA);
+ mtk_nfi_writel(host, 0, MTKSDG1_NFI_INTR_EN);
+
+ /* ECC encoder init */
+ mtk_ecc_encoder_idle(host);
+ mtk_ecc_writew(host, ENC_DE, MTKSDG1_ECC_ENCCON);
+
+ /* ECC decoder init */
+ mtk_ecc_decoder_idle(host);
+ mtk_ecc_writel(host, DEC_DE, MTKSDG1_ECC_DECCON);
+}
+
+static irqreturn_t mtk_nfi_irq(int irq, void *devid)
+{
+ struct mtk_nfc_host *host = devid;
+ u16 sta, ien;
+
+ sta = mtk_nfi_readw(host, MTKSDG1_NFI_INTR_STA);
+ ien = mtk_nfi_readw(host, MTKSDG1_NFI_INTR_EN);
+
+ if (!(sta & ien))
+ return IRQ_NONE;
+
+ mtk_nfi_writew(host, ~sta & ien, MTKSDG1_NFI_INTR_EN);
+ complete(&host->nfi.complete);
+
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t mtk_ecc_irq(int irq, void *devid)
+{
+ struct mtk_nfc_host *host = devid;
+ u32 reg_val, mask;
+
+ reg_val = mtk_ecc_readw(host, MTKSDG1_ECC_DECIRQ_STA);
+ if (reg_val & DEC_IRQEN) {
+ if (host->ecc.dec_sec) {
+ mask = 1 << (host->ecc.dec_sec - 1);
+ reg_val = mtk_ecc_readw(host, MTKSDG1_ECC_DECDONE);
+ if (mask & reg_val) {
+ host->ecc.dec_sec = 0;
+ complete(&host->ecc.complete);
+ mtk_ecc_writew(host, 0, MTKSDG1_ECC_DECIRQ_EN);
+ }
+ } else
+ dev_warn(host->dev, "spurious DEC_IRQ\n");
+
+ return IRQ_HANDLED;
+ }
+
+ reg_val = mtk_ecc_readl(host, MTKSDG1_ECC_ENCIRQ_STA);
+ if (reg_val & ENC_IRQEN) {
+ complete(&host->ecc.complete);
+ mtk_ecc_writel(host, 0, MTKSDG1_ECC_ENCIRQ_EN);
+
+ return IRQ_HANDLED;
+ }
+
+ return IRQ_NONE;
+}
+
+static int mtk_nfc_enable_clk(struct device *dev, struct mtk_nfc_clk *clk)
+{
+ int ret;
+
+ ret = clk_prepare_enable(clk->nfi_clk);
+ if (ret) {
+ dev_err(dev, "failed to enable nfi clk\n");
+ return ret;
+ }
+
+ ret = clk_prepare_enable(clk->nfiecc_clk);
+ if (ret) {
+ dev_err(dev, "failed to enable nfiecc clk\n");
+ goto out_nfiecc_clk_disable;
+ }
+
+ ret = clk_prepare_enable(clk->pad_clk);
+ if (ret) {
+ dev_err(dev, "failed to enable pad clk\n");
+ goto out_pad_clk_disable;
+ }
+
+ return 0;
+
+out_pad_clk_disable:
+ clk_disable_unprepare(clk->nfiecc_clk);
+
+out_nfiecc_clk_disable:
+ clk_disable_unprepare(clk->nfi_clk);
+
+ return ret;
+}
+
+static void mtk_nfc_disable_clk(struct mtk_nfc_clk *clk)
+{
+ clk_disable_unprepare(clk->nfi_clk);
+ clk_disable_unprepare(clk->nfiecc_clk);
+ clk_disable_unprepare(clk->pad_clk);
+}
+
+static int mtk_nfc_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct device_node *np = dev->of_node;
+ struct mtk_nfc_host *host;
+ struct nand_chip *chip;
+ struct mtd_info *mtd;
+ struct resource *res;
+ int ret, irq;
+ size_t len;
+
+ host = devm_kzalloc(dev, sizeof(*host), GFP_KERNEL);
+ if (!host)
+ return -ENOMEM;
+
+ chip = &host->chip;
+ mtd = nand_to_mtd(chip);
+ host->dev = dev;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ host->nfi.base = devm_ioremap_resource(dev, res);
+ if (IS_ERR(host->nfi.base)) {
+ ret = PTR_ERR(host->nfi.base);
+ dev_err(dev, "no nfi base\n");
+ return ret;
+ }
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+ host->ecc.base = devm_ioremap_resource(dev, res);
+ if (IS_ERR(host->ecc.base)) {
+ ret = PTR_ERR(host->ecc.base);
+ dev_err(dev, "no ecc base\n");
+ return ret;
+ }
+
+ host->clk.nfi_clk = devm_clk_get(dev, "nfi_clk");
+ if (IS_ERR(host->clk.nfi_clk)) {
+ dev_err(dev, "no clk\n");
+ ret = PTR_ERR(host->clk.nfi_clk);
+ return ret;
+ }
+
+ host->clk.nfiecc_clk = devm_clk_get(dev, "nfiecc_clk");
+ if (IS_ERR(host->clk.nfiecc_clk)) {
+ dev_err(dev, "no ecc clk\n");
+ ret = PTR_ERR(host->clk.nfiecc_clk);
+ return ret;
+ }
+
+ host->clk.pad_clk = devm_clk_get(dev, "pad_clk");
+ if (IS_ERR(host->clk.pad_clk)) {
+ dev_err(dev, "no pad clk\n");
+ ret = PTR_ERR(host->clk.pad_clk);
+ return ret;
+ }
+
+ ret = mtk_nfc_enable_clk(dev, &host->clk);
+ if (ret)
+ return ret;
+
+ irq = platform_get_irq(pdev, 0);
+ if (irq < 0) {
+ dev_err(dev, "no nfi irq resource\n");
+ ret = -EINVAL;
+ goto clk_disable;
+ }
+
+ ret = devm_request_irq(dev, irq, mtk_nfi_irq, 0x0, MTK_IRQ_NFI, host);
+ if (ret) {
+ dev_err(dev, "failed to request nfi irq\n");
+ goto clk_disable;
+ }
+
+ irq = platform_get_irq(pdev, 1);
+ if (irq < 0) {
+ dev_err(dev, "no ecc irq resource\n");
+ ret = -EINVAL;
+ goto clk_disable;
+ }
+
+ ret = devm_request_irq(dev, irq, mtk_ecc_irq, 0x0, MTK_IRQ_ECC, host);
+ if (ret) {
+ dev_err(dev, "failed to request ecc irq\n");
+ goto clk_disable;
+ }
+
+ ret = dma_set_mask(dev, DMA_BIT_MASK(32));
+ if (ret) {
+ dev_err(dev, "failed to set dma mask\n");
+ goto clk_disable;
+ }
+
+ platform_set_drvdata(pdev, host);
+
+ mtd_set_of_node(mtd, np);
+ mtd->owner = THIS_MODULE;
+ mtd->dev.parent = dev;
+ mtd->name = MTK_NAME;
+
+ nand_set_controller_data(chip, host);
+ chip->options |= NAND_USE_BOUNCE_BUFFER | NAND_SUBPAGE_READ;
+ chip->block_markbad = mtk_nfc_block_markbad;
+ chip->select_chip = mtk_nfc_select_chip;
+ chip->read_byte = mtk_nfc_read_byte;
+ chip->cmdfunc = mtk_nfc_cmdfunc;
+ chip->ecc.mode = NAND_ECC_HW;
+ chip->ecc.write_subpage = mtk_nfc_write_subpage_hwecc;
+ chip->ecc.write_page_raw = mtk_nfc_write_page_raw;
+ chip->ecc.write_page = mtk_nfc_write_page_hwecc;
+ chip->ecc.write_oob_raw = mtk_nfc_write_oob_raw;
+ chip->ecc.write_oob = mtk_nfc_write_oob;
+ chip->ecc.read_subpage = mtk_nfc_read_subpage_hwecc;
+ chip->ecc.read_page_raw = mtk_nfc_read_page_raw;
+ chip->ecc.read_oob_raw = mtk_nfc_read_oob_raw;
+ chip->ecc.read_page = mtk_nfc_read_page_hwecc;
+ chip->ecc.read_oob = mtk_nfc_read_oob;
+
+ mtk_nfc_hw_init(host);
+
+ ret = nand_scan_ident(mtd, MTK_NAND_MAX_CHIP, NULL);
+ if (ret) {
+ ret = -ENODEV;
+ goto clk_disable;
+ }
+
+ ret = mtk_nfc_hw_runtime_config(mtd);
+ if (ret < 0) {
+ dev_err(dev, "nand device not supported\n");
+ goto clk_disable;
+ }
+
+ len = mtd->writesize + mtd->oobsize;
+ host->buffer = devm_kzalloc(dev, len, GFP_KERNEL);
+ if (!host->buffer) {
+ ret = -ENOMEM;
+ goto clk_disable;
+ }
+
+ /* required to create bbt table if not present */
+ host->switch_oob = true;
+ ret = nand_scan_tail(mtd);
+ if (ret) {
+ ret = -ENODEV;
+ goto clk_disable;
+ }
+ host->switch_oob = false;
+
+ ret = mtd_device_parse_register(mtd, NULL, NULL, NULL, 0);
+ if (ret) {
+ dev_err(dev, "mtd parse partition error\n");
+ goto nand_free;
+ }
+
+ return 0;
+
+nand_free:
+ nand_release(mtd);
+
+clk_disable:
+ mtk_nfc_disable_clk(&host->clk);
+
+ return ret;
+}
+
+static int mtk_nfc_remove(struct platform_device *pdev)
+{
+ struct mtk_nfc_host *host = platform_get_drvdata(pdev);
+ struct mtd_info *mtd = nand_to_mtd(&host->chip);
+
+ nand_release(mtd);
+ mtk_nfc_disable_clk(&host->clk);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int mtk_nfc_suspend(struct device *dev)
+{
+ struct mtk_nfc_host *host = dev_get_drvdata(dev);
+ struct mtk_nfc_saved_reg *reg = &host->saved_reg;
+
+ reg->nfi.emp_thresh = mtk_nfi_readl(host, MTKSDG1_NFI_EMPTY_THRESH);
+ reg->ecc.enccnfg = mtk_ecc_readl(host, MTKSDG1_ECC_ENCCNFG);
+ reg->ecc.deccnfg = mtk_ecc_readl(host, MTKSDG1_ECC_DECCNFG);
+ reg->nfi.pagefmt = mtk_nfi_readw(host, MTKSDG1_NFI_PAGEFMT);
+ reg->nfi.acccon = mtk_nfi_readl(host, MTKSDG1_NFI_ACCCON);
+ reg->nfi.cnrnb = mtk_nfi_readw(host, MTKSDG1_NFI_CNRNB);
+ reg->nfi.csel = mtk_nfi_readw(host, MTKSDG1_NFI_CSEL);
+
+ mtk_nfc_disable_clk(&host->clk);
+
+ return 0;
+}
+
+static int mtk_nfc_resume(struct device *dev)
+{
+ struct mtk_nfc_host *host = dev_get_drvdata(dev);
+ struct mtk_nfc_saved_reg *reg = &host->saved_reg;
+ struct nand_chip *chip = &host->chip;
+ struct mtd_info *mtd = nand_to_mtd(chip);
+ int ret;
+ u32 i;
+
+ udelay(200);
+
+ ret = mtk_nfc_enable_clk(dev, &host->clk);
+ if (ret)
+ return ret;
+
+ for (i = 0; i < chip->numchips; i++) {
+ chip->select_chip(mtd, i);
+ chip->cmdfunc(mtd, NAND_CMD_RESET, -1, -1);
+ }
+
+ mtk_nfi_writel(host, reg->nfi.emp_thresh, MTKSDG1_NFI_EMPTY_THRESH);
+ mtk_nfi_writew(host, reg->nfi.pagefmt, MTKSDG1_NFI_PAGEFMT);
+ mtk_ecc_writel(host, reg->ecc.enccnfg, MTKSDG1_ECC_ENCCNFG);
+ mtk_ecc_writel(host, reg->ecc.deccnfg, MTKSDG1_ECC_DECCNFG);
+ mtk_nfi_writel(host, reg->nfi.acccon, MTKSDG1_NFI_ACCCON);
+ mtk_nfi_writew(host, reg->nfi.cnrnb, MTKSDG1_NFI_CNRNB);
+ mtk_nfi_writew(host, reg->nfi.csel, MTKSDG1_NFI_CSEL);
+
+ return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(mtk_nfc_pm_ops, mtk_nfc_suspend, mtk_nfc_resume);
+#endif
+
+static const struct of_device_id mtk_nfc_id_table[] = {
+ { .compatible = "mediatek,mt2701-nfc" },
+ {}
+};
+MODULE_DEVICE_TABLE(of, mtk_nfc_id_table);
+
+static struct platform_driver mtk_nfc_driver = {
+ .probe = mtk_nfc_probe,
+ .remove = mtk_nfc_remove,
+ .driver = {
+ .name = MTK_NAME,
+ .of_match_table = mtk_nfc_id_table,
+#ifdef CONFIG_PM_SLEEP
+ .pm = &mtk_nfc_pm_ops,
+#endif
+ },
+};
+
+module_platform_driver(mtk_nfc_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Xiaolei Li <xiaolei.li@mediatek.com>");
+MODULE_DESCRIPTION("MTK Nand Flash Controller Driver");
+
--- /dev/null
+++ b/drivers/mtd/nand/mtksdg1_nand_ecc.h
@@ -0,0 +1,75 @@
+/*
+ * MTK smart device ECC engine register.
+ * Copyright (C) 2015-2016 MediaTek Inc.
+ * Author: Xiaolei.Li <xiaolei.li@mediatek.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef MTKSDG1_NAND_ECC_H
+#define MTKSDG1_NAND_ECC_H
+
+/* ECC engine register definition */
+#define MTKSDG1_ECC_ENCCON (0x00)
+#define ENC_EN (1)
+#define ENC_DE (0)
+
+#define MTKSDG1_ECC_ENCCNFG (0x04)
+#define ECC_CNFG_4BIT (0)
+#define ECC_CNFG_12BIT (4)
+#define ECC_NFI_MODE BIT(5)
+#define ECC_DMA_MODE (0)
+#define ECC_ENC_MODE_MASK (0x3 << 5)
+#define ECC_MS_SHIFT (16)
+
+#define MTKSDG1_ECC_ENCDIADDR (0x08)
+
+#define MTKSDG1_ECC_ENCIDLE (0x0C)
+#define ENC_IDLE BIT(0)
+
+#define MTKSDG1_ECC_ENCPAR0 (0x10)
+#define MTKSDG1_ECC_ENCSTA (0x7C)
+
+#define MTKSDG1_ECC_ENCIRQ_EN (0x80)
+#define ENC_IRQEN BIT(0)
+
+#define MTKSDG1_ECC_ENCIRQ_STA (0x84)
+
+#define MTKSDG1_ECC_DECCON (0x100)
+#define DEC_EN (1)
+#define DEC_DE (0)
+
+#define MTKSDG1_ECC_DECCNFG (0x104)
+#define DEC_EMPTY_EN BIT(31)
+#define DEC_CNFG_FER (0x1 << 12)
+#define DEC_CNFG_EL (0x2 << 12)
+#define DEC_CNFG_CORRECT (0x3 << 12)
+
+#define MTKSDG1_ECC_DECIDLE (0x10C)
+#define DEC_IDLE BIT(0)
+
+#define MTKSDG1_ECC_DECFER (0x110)
+
+#define MTKSDG1_ECC_DECENUM0 (0x114)
+#define ERR_MASK (0x3f)
+
+#define MTKSDG1_ECC_DECDONE (0x124)
+
+#define MTKSDG1_ECC_DECEL0 (0x128)
+
+#define MTKSDG1_ECC_DECIRQ_EN (0x200)
+#define DEC_IRQEN BIT(0)
+
+#define MTKSDG1_ECC_DECIRQ_STA (0x204)
+
+#define MTKSDG1_ECC_DECFSM (0x208)
+#define DECFSM_MASK (0x7f0f0f0f)
+#define DECFSM_IDLE (0x01010101)
+#endif
--- /dev/null
+++ b/drivers/mtd/nand/mtksdg1_nand_nfi.h
@@ -0,0 +1,119 @@
+/*
+ * MTK smart device NAND Flash controller register.
+ * Copyright (C) 2015-2016 MediaTek Inc.
+ * Author: Xiaolei.Li <xiaolei.li@mediatek.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef MTKSDG1_NAND_NFI_H
+#define MTKSDG1_NAND_NFI_H
+
+/* NAND controller register definition */
+#define MTKSDG1_NFI_CNFG (0x00)
+#define CNFG_AHB BIT(0)
+#define CNFG_READ_EN BIT(1)
+#define CNFG_DMA_BURST_EN BIT(2)
+#define CNFG_BYTE_RW BIT(6)
+#define CNFG_HW_ECC_EN BIT(8)
+#define CNFG_AUTO_FMT_EN BIT(9)
+#define CNFG_OP_IDLE (0 << 12)
+#define CNFG_OP_READ (1 << 12)
+#define CNFG_OP_SRD (2 << 12)
+#define CNFG_OP_PRGM (3 << 12)
+#define CNFG_OP_ERASE (4 << 12)
+#define CNFG_OP_RESET (5 << 12)
+#define CNFG_OP_CUST (6 << 12)
+
+#define MTKSDG1_NFI_PAGEFMT (0x04)
+#define PAGEFMT_FDM_ECC_SHIFT (12)
+#define PAGEFMT_FDM_SHIFT (8)
+#define PAGEFMT_SPARE_16 (0)
+#define PAGEFMT_SPARE_32 (4)
+#define PAGEFMT_SPARE_SHIFT (4)
+#define PAGEFMT_SEC_SEL_512 BIT(2)
+#define PAGEFMT_512_2K (0)
+#define PAGEFMT_2K_4K (1)
+#define PAGEFMT_4K_8K (2)
+
+/* NFI control */
+#define MTKSDG1_NFI_CON (0x08)
+#define CON_FIFO_FLUSH BIT(0)
+#define CON_NFI_RST BIT(1)
+#define CON_SRD BIT(4) /* single read */
+#define CON_BRD BIT(8) /* burst read */
+#define CON_BWR BIT(9) /* burst write */
+#define CON_SEC_SHIFT (12)
+
+/* Timming control register */
+#define MTKSDG1_NFI_ACCCON (0x0C)
+
+#define MTKSDG1_NFI_INTR_EN (0x10)
+#define INTR_RD_DONE_EN BIT(0)
+#define INTR_WR_DONE_EN BIT(1)
+#define INTR_RST_DONE_EN BIT(2)
+#define INTR_ERS_DONE_EN BIT(3)
+#define INTR_BUSY_RT_EN BIT(4)
+#define INTR_AHB_DONE_EN BIT(6)
+
+#define MTKSDG1_NFI_INTR_STA (0x14)
+
+#define MTKSDG1_NFI_CMD (0x20)
+
+#define MTKSDG1_NFI_ADDRNOB (0x30)
+#define ADDR_ROW_NOB_SHIFT (4)
+
+#define MTKSDG1_NFI_COLADDR (0x34)
+#define MTKSDG1_NFI_ROWADDR (0x38)
+#define MTKSDG1_NFI_STRDATA (0x40)
+#define MTKSDG1_NFI_CNRNB (0x44)
+#define MTKSDG1_NFI_DATAW (0x50)
+#define MTKSDG1_NFI_DATAR (0x54)
+#define MTKSDG1_NFI_PIO_DIRDY (0x58)
+#define PIO_DI_RDY (0x01)
+
+/* NFI state*/
+#define MTKSDG1_NFI_STA (0x60)
+#define STA_CMD BIT(0)
+#define STA_ADDR BIT(1)
+#define STA_DATAR BIT(2)
+#define STA_DATAW BIT(3)
+#define STA_EMP_PAGE BIT(12)
+
+#define MTKSDG1_NFI_FIFOSTA (0x64)
+
+#define MTKSDG1_NFI_ADDRCNTR (0x70)
+#define CNTR_MASK GENMASK(16, 12)
+
+#define MTKSDG1_NFI_STRADDR (0x80)
+#define MTKSDG1_NFI_BYTELEN (0x84)
+#define MTKSDG1_NFI_CSEL (0x90)
+#define MTKSDG1_NFI_IOCON (0x94)
+
+/* FDM data for sector: FDM0[L,H] - FDMF[L,H] */
+#define MTKSDG1_NFI_FDM_MAX_SEC (0x10)
+#define MTKSDG1_NFI_FDM_REG_SIZE (8)
+#define MTKSDG1_NFI_FDM0L (0xA0)
+#define MTKSDG1_NFI_FDM0M (0xA4)
+
+
+#define MTKSDG1_NFI_FIFODATA0 (0x190)
+#define MTKSDG1_NFI_DEBUG_CON1 (0x220)
+#define MTKSDG1_NFI_MASTER_STA (0x224)
+#define MASTER_STA_MASK (0x0FFF)
+
+#define MTKSDG1_NFI_RANDOM_CNFG (0x238)
+#define MTKSDG1_NFI_EMPTY_THRESH (0x23C)
+#define MTKSDG1_NFI_NAND_TYPE (0x240)
+#define MTKSDG1_NFI_ACCCON1 (0x244)
+#define MTKSDG1_NFI_DELAY_CTRL (0x248)
+
+#endif
+
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